CONTROLLER AND METHOD OF CONTROLLING A ROD PUMPING UNIT

摘要

A controller (132) for operating a rod pumping unit (100; 700) at a pump speed. The controller includes a processor (410) configured to operate a pump piston (320) of the rod pumping unit at a first speed. The processor is further configured to determine a pump fillage level for a pump stroke based on a position signal and a load signal. The processor is further configured to reduce the pump speed to a second speed based on the pump fillage level for the pump stroke.